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Ribonuclease from Streptomyces aureofaciens at atomic resolution
J Sevcik1, Z Dauter, V S Lamzin
1Institute of Molecular Biology, Slovak Academy of Sciences, Bratislava, Slovak Republic.
Summary
Streptomyces aureofaciens ribonuclease was crystallized and analyzed at atomic resolution using X-ray diffraction. This high-resolution structural analysis revealed new details about the enzyme
Area of Science:
- Biochemistry
- Structural Biology
- Crystallography
Background:
- Ribonucleases are essential enzymes involved in RNA metabolism.
- Understanding enzyme structure is crucial for function elucidation.
- Streptomyces aureofaciens ribonuclease structure was previously determined at lower resolution.
Purpose of the Study:
- To determine the high-resolution crystal structure of Streptomyces aureofaciens ribonuclease.
- To refine the enzyme's structure using advanced crystallographic methods.
- To investigate the enzyme's nucleotide binding site and identify key residues.
Main Methods:
- X-ray diffraction data collection using synchrotron radiation and an imaging-plate scanner.
- Structure determination and refinement to atomic resolution (1.15-1.20 Å).
- Anisotropic refinement and automated solvent modeling.
Main Results:
- Achieved atomic resolution (1.15-1.20 Å) for native and complexed ribonuclease crystals.
- High accuracy structure with root-mean-square error of 0.05 Å in coordinates.
- Identified a partially occupied anion in the nucleotide binding site and corrected residue 72 from cysteine to threonine.
Conclusions:
- The high-resolution structure provides unprecedented detail of Streptomyces aureofaciens ribonuclease.
- Accurate structural data enabled identification of previously unobserved features, including an anion.
- The corrected residue identity at position 72 refines our understanding of the enzyme's active site.